Question

Write chemical composition of haematite. Write the names and electronic configurations of first two elements of group 17.

Answer 1

Haematite = Fe₂O₃

First two elements of group 17.

1. Fluorine (F) (9) = 1s² 2s² 2p⁵
2. Chlorine (Cl) (17) = 1s² 2s² 2p⁶ 3s² 3p⁵